i believe the answer u might be looking for is number 3. plants breathe carbon dioxide, so an increase in plant life could help aid world hunger.
D. Scientists use all of the above skills.
Your answer would be: A. because scientists use what they have to create a theory, a theory is pretty much an educated guess is what a teacher would say, the theory would need to have evidence in order for it to be an educated guess. The scientist would have to come up with an explanation in order for the theory to work, or be an educated guess.
D. specialize cells perform specific functions in the body
Ions are formed when an atom gains or lose electron during a chemical reaction.
<h3>How ions are formed?</h3>
Ions are formed by the addition of electrons or the removal of electrons from an atoms or molecules by the combination of ions with other particles. Ions formation occurs during covalent bond formation and ionic bond formation between different molecules. Those substances that gains electron bears positive ion while on the other hand, those elements that lose electron forms negative ion or charge on the atom.
So we can conclude that ions are formed when an atom gains or lose electron during a chemical reaction.
Learn more about ions here: brainly.com/question/2687188
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